2 * Copyright (c) 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
5 * This code is derived from software contributed to The DragonFly Project
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific, prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Copyright (c) 1982, 1986, 1988, 1990, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
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51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
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55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94
67 * $FreeBSD: src/sys/kern/uipc_socket.c,v 1.68.2.24 2003/11/11 17:18:18 silby Exp $
68 * $DragonFly: src/sys/kern/uipc_socket.c,v 1.55 2008/09/02 16:17:52 dillon Exp $
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/fcntl.h>
77 #include <sys/malloc.h>
79 #include <sys/domain.h>
80 #include <sys/file.h> /* for struct knote */
81 #include <sys/kernel.h>
82 #include <sys/malloc.h>
83 #include <sys/event.h>
86 #include <sys/protosw.h>
87 #include <sys/socket.h>
88 #include <sys/socketvar.h>
89 #include <sys/socketops.h>
90 #include <sys/resourcevar.h>
91 #include <sys/signalvar.h>
92 #include <sys/sysctl.h>
95 #include <vm/vm_zone.h>
98 #include <sys/thread2.h>
99 #include <sys/socketvar2.h>
101 #include <machine/limits.h>
104 static int do_setopt_accept_filter(struct socket
*so
, struct sockopt
*sopt
);
107 static void filt_sordetach(struct knote
*kn
);
108 static int filt_soread(struct knote
*kn
, long hint
);
109 static void filt_sowdetach(struct knote
*kn
);
110 static int filt_sowrite(struct knote
*kn
, long hint
);
111 static int filt_solisten(struct knote
*kn
, long hint
);
113 static struct filterops solisten_filtops
=
114 { 1, NULL
, filt_sordetach
, filt_solisten
};
115 static struct filterops soread_filtops
=
116 { 1, NULL
, filt_sordetach
, filt_soread
};
117 static struct filterops sowrite_filtops
=
118 { 1, NULL
, filt_sowdetach
, filt_sowrite
};
120 MALLOC_DEFINE(M_SOCKET
, "socket", "socket struct");
121 MALLOC_DEFINE(M_SONAME
, "soname", "socket name");
122 MALLOC_DEFINE(M_PCB
, "pcb", "protocol control block");
125 static int somaxconn
= SOMAXCONN
;
126 SYSCTL_INT(_kern_ipc
, KIPC_SOMAXCONN
, somaxconn
, CTLFLAG_RW
,
127 &somaxconn
, 0, "Maximum pending socket connection queue size");
130 * Socket operation routines.
131 * These routines are called by the routines in
132 * sys_socket.c or from a system process, and
133 * implement the semantics of socket operations by
134 * switching out to the protocol specific routines.
138 * Get a socket structure, and initialize it.
139 * Note that it would probably be better to allocate socket
140 * and PCB at the same time, but I'm not convinced that all
141 * the protocols can be easily modified to do this.
149 waitmask
= waitok
? M_WAITOK
: M_NOWAIT
;
150 so
= kmalloc(sizeof(struct socket
), M_SOCKET
, M_ZERO
|waitmask
);
152 /* XXX race condition for reentrant kernel */
153 TAILQ_INIT(&so
->so_aiojobq
);
154 TAILQ_INIT(&so
->so_rcv
.ssb_sel
.si_mlist
);
155 TAILQ_INIT(&so
->so_snd
.ssb_sel
.si_mlist
);
161 socreate(int dom
, struct socket
**aso
, int type
,
162 int proto
, struct thread
*td
)
164 struct proc
*p
= td
->td_proc
;
167 struct pru_attach_info ai
;
171 prp
= pffindproto(dom
, proto
, type
);
173 prp
= pffindtype(dom
, type
);
175 if (prp
== 0 || prp
->pr_usrreqs
->pru_attach
== 0)
176 return (EPROTONOSUPPORT
);
178 if (p
->p_ucred
->cr_prison
&& jail_socket_unixiproute_only
&&
179 prp
->pr_domain
->dom_family
!= PF_LOCAL
&&
180 prp
->pr_domain
->dom_family
!= PF_INET
&&
181 prp
->pr_domain
->dom_family
!= PF_INET6
&&
182 prp
->pr_domain
->dom_family
!= PF_ROUTE
) {
183 return (EPROTONOSUPPORT
);
186 if (prp
->pr_type
!= type
)
188 so
= soalloc(p
!= 0);
192 TAILQ_INIT(&so
->so_incomp
);
193 TAILQ_INIT(&so
->so_comp
);
195 so
->so_cred
= crhold(p
->p_ucred
);
197 ai
.sb_rlimit
= &p
->p_rlimit
[RLIMIT_SBSIZE
];
198 ai
.p_ucred
= p
->p_ucred
;
199 ai
.fd_rdir
= p
->p_fd
->fd_rdir
;
200 error
= so_pru_attach(so
, proto
, &ai
);
202 so
->so_state
|= SS_NOFDREF
;
211 sobind(struct socket
*so
, struct sockaddr
*nam
, struct thread
*td
)
216 error
= so_pru_bind(so
, nam
, td
);
222 sodealloc(struct socket
*so
)
224 if (so
->so_rcv
.ssb_hiwat
)
225 (void)chgsbsize(so
->so_cred
->cr_uidinfo
,
226 &so
->so_rcv
.ssb_hiwat
, 0, RLIM_INFINITY
);
227 if (so
->so_snd
.ssb_hiwat
)
228 (void)chgsbsize(so
->so_cred
->cr_uidinfo
,
229 &so
->so_snd
.ssb_hiwat
, 0, RLIM_INFINITY
);
231 /* remove accept filter if present */
232 if (so
->so_accf
!= NULL
)
233 do_setopt_accept_filter(so
, NULL
);
240 solisten(struct socket
*so
, int backlog
, struct thread
*td
)
244 short oldopt
, oldqlimit
;
248 if (so
->so_state
& (SS_ISCONNECTED
| SS_ISCONNECTING
)) {
254 oldopt
= so
->so_options
;
255 oldqlimit
= so
->so_qlimit
;
258 if (TAILQ_EMPTY(&so
->so_comp
))
259 so
->so_options
|= SO_ACCEPTCONN
;
260 if (backlog
< 0 || backlog
> somaxconn
)
262 so
->so_qlimit
= backlog
;
263 /* SCTP needs to look at tweak both the inbound backlog parameter AND
264 * the so_options (UDP model both connect's and gets inbound
265 * connections .. implicitly).
267 error
= so_pru_listen(so
, td
);
270 /* Restore the params */
271 so
->so_options
= oldopt
;
272 so
->so_qlimit
= oldqlimit
;
282 * Destroy a disconnected socket. This routine is a NOP if entities
283 * still have a reference on the socket:
285 * so_pcb - The protocol stack still has a reference
286 * SS_NOFDREF - There is no longer a file pointer reference
287 * SS_ABORTING - An abort netmsg is in-flight
290 sofree(struct socket
*so
)
292 struct socket
*head
= so
->so_head
;
294 if (so
->so_pcb
|| (so
->so_state
& SS_NOFDREF
) == 0)
296 if (so
->so_state
& SS_ABORTING
)
299 if (so
->so_state
& SS_INCOMP
) {
300 TAILQ_REMOVE(&head
->so_incomp
, so
, so_list
);
302 } else if (so
->so_state
& SS_COMP
) {
304 * We must not decommission a socket that's
305 * on the accept(2) queue. If we do, then
306 * accept(2) may hang after select(2) indicated
307 * that the listening socket was ready.
311 panic("sofree: not queued");
313 so
->so_state
&= ~SS_INCOMP
;
316 ssb_release(&so
->so_snd
, so
);
322 * Close a socket on last file table reference removal.
323 * Initiate disconnect if connected.
324 * Free socket when disconnect complete.
327 soclose(struct socket
*so
, int fflag
)
332 funsetown(so
->so_sigio
);
333 if (so
->so_pcb
== NULL
)
335 if (so
->so_state
& SS_ISCONNECTED
) {
336 if ((so
->so_state
& SS_ISDISCONNECTING
) == 0) {
337 error
= sodisconnect(so
);
341 if (so
->so_options
& SO_LINGER
) {
342 if ((so
->so_state
& SS_ISDISCONNECTING
) &&
345 while (so
->so_state
& SS_ISCONNECTED
) {
346 error
= tsleep((caddr_t
)&so
->so_timeo
,
347 PCATCH
, "soclos", so
->so_linger
* hz
);
357 error2
= so_pru_detach(so
);
362 if (so
->so_options
& SO_ACCEPTCONN
) {
365 while ((sp
= TAILQ_FIRST(&so
->so_incomp
)) != NULL
) {
366 TAILQ_REMOVE(&so
->so_incomp
, sp
, so_list
);
367 sp
->so_state
&= ~SS_INCOMP
;
372 while ((sp
= TAILQ_FIRST(&so
->so_comp
)) != NULL
) {
373 TAILQ_REMOVE(&so
->so_comp
, sp
, so_list
);
374 sp
->so_state
&= ~SS_COMP
;
380 if (so
->so_state
& SS_NOFDREF
)
381 panic("soclose: NOFDREF");
382 so
->so_state
|= SS_NOFDREF
;
389 * Abort and destroy a socket. Only one abort can be in progress
390 * at any given moment.
393 soabort(struct socket
*so
)
395 if ((so
->so_state
& SS_ABORTING
) == 0) {
396 so
->so_state
|= SS_ABORTING
;
402 soaborta(struct socket
*so
)
404 if ((so
->so_state
& SS_ABORTING
) == 0) {
405 so
->so_state
|= SS_ABORTING
;
411 soaccept(struct socket
*so
, struct sockaddr
**nam
)
416 if ((so
->so_state
& SS_NOFDREF
) == 0)
417 panic("soaccept: !NOFDREF");
418 so
->so_state
&= ~SS_NOFDREF
;
419 error
= so_pru_accept(so
, nam
);
425 soconnect(struct socket
*so
, struct sockaddr
*nam
, struct thread
*td
)
429 if (so
->so_options
& SO_ACCEPTCONN
)
433 * If protocol is connection-based, can only connect once.
434 * Otherwise, if connected, try to disconnect first.
435 * This allows user to disconnect by connecting to, e.g.,
438 if (so
->so_state
& (SS_ISCONNECTED
|SS_ISCONNECTING
) &&
439 ((so
->so_proto
->pr_flags
& PR_CONNREQUIRED
) ||
440 (error
= sodisconnect(so
)))) {
444 * Prevent accumulated error from previous connection
448 error
= so_pru_connect(so
, nam
, td
);
455 soconnect2(struct socket
*so1
, struct socket
*so2
)
460 error
= so_pru_connect2(so1
, so2
);
466 sodisconnect(struct socket
*so
)
471 if ((so
->so_state
& SS_ISCONNECTED
) == 0) {
475 if (so
->so_state
& SS_ISDISCONNECTING
) {
479 error
= so_pru_disconnect(so
);
485 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
488 * If send must go all at once and message is larger than
489 * send buffering, then hard error.
490 * Lock against other senders.
491 * If must go all at once and not enough room now, then
492 * inform user that this would block and do nothing.
493 * Otherwise, if nonblocking, send as much as possible.
494 * The data to be sent is described by "uio" if nonzero,
495 * otherwise by the mbuf chain "top" (which must be null
496 * if uio is not). Data provided in mbuf chain must be small
497 * enough to send all at once.
499 * Returns nonzero on error, timeout or signal; callers
500 * must check for short counts if EINTR/ERESTART are returned.
501 * Data and control buffers are freed on return.
504 sosend(struct socket
*so
, struct sockaddr
*addr
, struct uio
*uio
,
505 struct mbuf
*top
, struct mbuf
*control
, int flags
,
510 long space
, len
, resid
;
511 int clen
= 0, error
, dontroute
, mlen
;
512 int atomic
= sosendallatonce(so
) || top
;
516 resid
= uio
->uio_resid
;
518 resid
= top
->m_pkthdr
.len
;
520 * In theory resid should be unsigned.
521 * However, space must be signed, as it might be less than 0
522 * if we over-committed, and we must use a signed comparison
523 * of space and resid. On the other hand, a negative resid
524 * causes us to loop sending 0-length segments to the protocol.
526 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
527 * type sockets since that's an error.
529 if (resid
< 0 || (so
->so_type
== SOCK_STREAM
&& (flags
& MSG_EOR
))) {
535 (flags
& MSG_DONTROUTE
) && (so
->so_options
& SO_DONTROUTE
) == 0 &&
536 (so
->so_proto
->pr_flags
& PR_ATOMIC
);
537 if (td
->td_lwp
!= NULL
)
538 td
->td_lwp
->lwp_ru
.ru_msgsnd
++;
540 clen
= control
->m_len
;
541 #define gotoerr(errcode) { error = errcode; crit_exit(); goto release; }
544 error
= ssb_lock(&so
->so_snd
, SBLOCKWAIT(flags
));
549 if (so
->so_state
& SS_CANTSENDMORE
)
552 error
= so
->so_error
;
557 if ((so
->so_state
& SS_ISCONNECTED
) == 0) {
559 * `sendto' and `sendmsg' is allowed on a connection-
560 * based socket if it supports implied connect.
561 * Return ENOTCONN if not connected and no address is
564 if ((so
->so_proto
->pr_flags
& PR_CONNREQUIRED
) &&
565 (so
->so_proto
->pr_flags
& PR_IMPLOPCL
) == 0) {
566 if ((so
->so_state
& SS_ISCONFIRMING
) == 0 &&
567 !(resid
== 0 && clen
!= 0))
569 } else if (addr
== 0)
570 gotoerr(so
->so_proto
->pr_flags
& PR_CONNREQUIRED
?
571 ENOTCONN
: EDESTADDRREQ
);
573 if ((atomic
&& resid
> so
->so_snd
.ssb_hiwat
) ||
574 clen
> so
->so_snd
.ssb_hiwat
) {
577 space
= ssb_space(&so
->so_snd
);
580 if (space
< resid
+ clen
&& uio
&&
581 (atomic
|| space
< so
->so_snd
.ssb_lowat
|| space
< clen
)) {
582 if (flags
& (MSG_FNONBLOCKING
|MSG_DONTWAIT
))
583 gotoerr(EWOULDBLOCK
);
584 ssb_unlock(&so
->so_snd
);
585 error
= ssb_wait(&so
->so_snd
);
597 * Data is prepackaged in "top".
601 top
->m_flags
|= M_EOR
;
603 m
= m_getl(resid
, MB_WAIT
, MT_DATA
,
604 top
== NULL
? M_PKTHDR
: 0, &mlen
);
607 m
->m_pkthdr
.rcvif
= (struct ifnet
*)0;
609 len
= min(min(mlen
, resid
), space
);
610 if (resid
< MINCLSIZE
) {
612 * For datagram protocols, leave room
613 * for protocol headers in first mbuf.
615 if (atomic
&& top
== 0 && len
< mlen
)
619 error
= uiomove(mtod(m
, caddr_t
), (int)len
, uio
);
620 resid
= uio
->uio_resid
;
623 top
->m_pkthdr
.len
+= len
;
629 top
->m_flags
|= M_EOR
;
632 } while (space
> 0 && atomic
);
634 so
->so_options
|= SO_DONTROUTE
;
635 if (flags
& MSG_OOB
) {
636 pru_flags
= PRUS_OOB
;
637 } else if ((flags
& MSG_EOF
) &&
638 (so
->so_proto
->pr_flags
& PR_IMPLOPCL
) &&
641 * If the user set MSG_EOF, the protocol
642 * understands this flag and nothing left to
643 * send then use PRU_SEND_EOF instead of PRU_SEND.
645 pru_flags
= PRUS_EOF
;
646 } else if (resid
> 0 && space
> 0) {
647 /* If there is more to send, set PRUS_MORETOCOME */
648 pru_flags
= PRUS_MORETOCOME
;
654 * XXX all the SS_CANTSENDMORE checks previously
655 * done could be out of date. We could have recieved
656 * a reset packet in an interrupt or maybe we slept
657 * while doing page faults in uiomove() etc. We could
658 * probably recheck again inside the splnet() protection
659 * here, but there are probably other places that this
660 * also happens. We must rethink this.
662 error
= so_pru_send(so
, pru_flags
, top
, addr
, control
, td
);
665 so
->so_options
&= ~SO_DONTROUTE
;
672 } while (resid
&& space
> 0);
676 ssb_unlock(&so
->so_snd
);
686 * A specialization of sosend() for UDP based on protocol-specific knowledge:
687 * so->so_proto->pr_flags has the PR_ATOMIC field set. This means that
688 * sosendallatonce() returns true,
689 * the "atomic" variable is true,
690 * and sosendudp() blocks until space is available for the entire send.
691 * so->so_proto->pr_flags does not have the PR_CONNREQUIRED or
692 * PR_IMPLOPCL flags set.
693 * UDP has no out-of-band data.
694 * UDP has no control data.
695 * UDP does not support MSG_EOR.
698 sosendudp(struct socket
*so
, struct sockaddr
*addr
, struct uio
*uio
,
699 struct mbuf
*top
, struct mbuf
*control
, int flags
, struct thread
*td
)
702 boolean_t dontroute
; /* temporary SO_DONTROUTE setting */
704 if (td
->td_lwp
!= NULL
)
705 td
->td_lwp
->lwp_ru
.ru_msgsnd
++;
709 KASSERT((uio
&& !top
) || (top
&& !uio
), ("bad arguments to sosendudp"));
710 resid
= uio
? uio
->uio_resid
: top
->m_pkthdr
.len
;
713 error
= ssb_lock(&so
->so_snd
, SBLOCKWAIT(flags
));
718 if (so
->so_state
& SS_CANTSENDMORE
)
721 error
= so
->so_error
;
726 if (!(so
->so_state
& SS_ISCONNECTED
) && addr
== NULL
)
727 gotoerr(EDESTADDRREQ
);
728 if (resid
> so
->so_snd
.ssb_hiwat
)
730 if (uio
&& ssb_space(&so
->so_snd
) < resid
) {
731 if (flags
& (MSG_FNONBLOCKING
|MSG_DONTWAIT
))
732 gotoerr(EWOULDBLOCK
);
733 ssb_unlock(&so
->so_snd
);
734 error
= ssb_wait(&so
->so_snd
);
743 top
= m_uiomove(uio
);
748 dontroute
= (flags
& MSG_DONTROUTE
) && !(so
->so_options
& SO_DONTROUTE
);
750 so
->so_options
|= SO_DONTROUTE
;
752 error
= so_pru_send(so
, 0, top
, addr
, NULL
, td
);
753 top
= NULL
; /* sent or freed in lower layer */
756 so
->so_options
&= ~SO_DONTROUTE
;
759 ssb_unlock(&so
->so_snd
);
767 * Implement receive operations on a socket.
768 * We depend on the way that records are added to the signalsockbuf
769 * by sbappend*. In particular, each record (mbufs linked through m_next)
770 * must begin with an address if the protocol so specifies,
771 * followed by an optional mbuf or mbufs containing ancillary data,
772 * and then zero or more mbufs of data.
773 * In order to avoid blocking network interrupts for the entire time here,
774 * we exit the critical section while doing the actual copy to user space.
775 * Although the signalsockbuf is locked, new data may still be appended,
776 * and thus we must maintain consistency of the signalsockbuf during that time.
778 * The caller may receive the data as a single mbuf chain by supplying
779 * an mbuf **mp0 for use in returning the chain. The uio is then used
780 * only for the count in uio_resid.
783 soreceive(struct socket
*so
, struct sockaddr
**psa
, struct uio
*uio
,
784 struct sockbuf
*sio
, struct mbuf
**controlp
, int *flagsp
)
787 struct mbuf
*free_chain
= NULL
;
788 int flags
, len
, error
, offset
;
789 struct protosw
*pr
= so
->so_proto
;
791 int resid
, orig_resid
;
794 resid
= uio
->uio_resid
;
796 resid
= (int)(sio
->sb_climit
- sio
->sb_cc
);
804 flags
= *flagsp
&~ MSG_EOR
;
807 if (flags
& MSG_OOB
) {
808 m
= m_get(MB_WAIT
, MT_DATA
);
811 error
= so_pru_rcvoob(so
, m
, flags
& MSG_PEEK
);
818 } while (resid
> 0 && m
);
821 uio
->uio_resid
= resid
;
822 error
= uiomove(mtod(m
, caddr_t
),
823 (int)min(resid
, m
->m_len
), uio
);
824 resid
= uio
->uio_resid
;
826 } while (uio
->uio_resid
&& error
== 0 && m
);
833 if (so
->so_state
& SS_ISCONFIRMING
&& resid
)
838 error
= ssb_lock(&so
->so_rcv
, SBLOCKWAIT(flags
));
842 m
= so
->so_rcv
.ssb_mb
;
844 * If we have less data than requested, block awaiting more
845 * (subject to any timeout) if:
846 * 1. the current count is less than the low water mark, or
847 * 2. MSG_WAITALL is set, and it is possible to do the entire
848 * receive operation at once if we block (resid <= hiwat).
849 * 3. MSG_DONTWAIT is not set
850 * If MSG_WAITALL is set but resid is larger than the receive buffer,
851 * we have to do the receive in sections, and thus risk returning
852 * a short count if a timeout or signal occurs after we start.
854 if (m
== NULL
|| (((flags
& MSG_DONTWAIT
) == 0 &&
855 so
->so_rcv
.ssb_cc
< resid
) &&
856 (so
->so_rcv
.ssb_cc
< so
->so_rcv
.ssb_lowat
||
857 ((flags
& MSG_WAITALL
) && resid
<= so
->so_rcv
.ssb_hiwat
)) &&
858 m
->m_nextpkt
== 0 && (pr
->pr_flags
& PR_ATOMIC
) == 0)) {
859 KASSERT(m
!= NULL
|| !so
->so_rcv
.ssb_cc
, ("receive 1"));
863 error
= so
->so_error
;
864 if ((flags
& MSG_PEEK
) == 0)
868 if (so
->so_state
& SS_CANTRCVMORE
) {
874 for (; m
; m
= m
->m_next
) {
875 if (m
->m_type
== MT_OOBDATA
|| (m
->m_flags
& M_EOR
)) {
876 m
= so
->so_rcv
.ssb_mb
;
880 if ((so
->so_state
& (SS_ISCONNECTED
|SS_ISCONNECTING
)) == 0 &&
881 (pr
->pr_flags
& PR_CONNREQUIRED
)) {
887 if (flags
& (MSG_FNONBLOCKING
|MSG_DONTWAIT
)) {
891 ssb_unlock(&so
->so_rcv
);
892 error
= ssb_wait(&so
->so_rcv
);
899 if (uio
&& uio
->uio_td
&& uio
->uio_td
->td_proc
)
900 uio
->uio_td
->td_lwp
->lwp_ru
.ru_msgrcv
++;
903 * note: m should be == sb_mb here. Cache the next record while
904 * cleaning up. Note that calling m_free*() will break out critical
907 KKASSERT(m
== so
->so_rcv
.ssb_mb
);
910 * Skip any address mbufs prepending the record.
912 if (pr
->pr_flags
& PR_ADDR
) {
913 KASSERT(m
->m_type
== MT_SONAME
, ("receive 1a"));
916 *psa
= dup_sockaddr(mtod(m
, struct sockaddr
*));
917 if (flags
& MSG_PEEK
)
920 m
= sbunlinkmbuf(&so
->so_rcv
.sb
, m
, &free_chain
);
924 * Skip any control mbufs prepending the record.
927 if (pr
->pr_flags
& PR_ADDR_OPT
) {
929 * For SCTP we may be getting a
930 * whole message OR a partial delivery.
932 if (m
&& m
->m_type
== MT_SONAME
) {
935 *psa
= dup_sockaddr(mtod(m
, struct sockaddr
*));
936 if (flags
& MSG_PEEK
)
939 m
= sbunlinkmbuf(&so
->so_rcv
.sb
, m
, &free_chain
);
943 while (m
&& m
->m_type
== MT_CONTROL
&& error
== 0) {
944 if (flags
& MSG_PEEK
) {
946 *controlp
= m_copy(m
, 0, m
->m_len
);
947 m
= m
->m_next
; /* XXX race */
950 n
= sbunlinkmbuf(&so
->so_rcv
.sb
, m
, NULL
);
951 if (pr
->pr_domain
->dom_externalize
&&
952 mtod(m
, struct cmsghdr
*)->cmsg_type
==
954 error
= (*pr
->pr_domain
->dom_externalize
)(m
);
958 m
= sbunlinkmbuf(&so
->so_rcv
.sb
, m
, &free_chain
);
961 if (controlp
&& *controlp
) {
963 controlp
= &(*controlp
)->m_next
;
972 if (type
== MT_OOBDATA
)
977 * Copy to the UIO or mbuf return chain (*mp).
981 while (m
&& resid
> 0 && error
== 0) {
982 if (m
->m_type
== MT_OOBDATA
) {
983 if (type
!= MT_OOBDATA
)
985 } else if (type
== MT_OOBDATA
)
988 KASSERT(m
->m_type
== MT_DATA
|| m
->m_type
== MT_HEADER
,
990 so
->so_state
&= ~SS_RCVATMARK
;
992 if (so
->so_oobmark
&& len
> so
->so_oobmark
- offset
)
993 len
= so
->so_oobmark
- offset
;
994 if (len
> m
->m_len
- moff
)
995 len
= m
->m_len
- moff
;
998 * Copy out to the UIO or pass the mbufs back to the SIO.
999 * The SIO is dealt with when we eat the mbuf, but deal
1000 * with the resid here either way.
1004 uio
->uio_resid
= resid
;
1005 error
= uiomove(mtod(m
, caddr_t
) + moff
, len
, uio
);
1006 resid
= uio
->uio_resid
;
1015 * Eat the entire mbuf or just a piece of it
1017 if (len
== m
->m_len
- moff
) {
1018 if (m
->m_flags
& M_EOR
)
1021 if (m
->m_flags
& M_NOTIFICATION
)
1022 flags
|= MSG_NOTIFICATION
;
1024 if (flags
& MSG_PEEK
) {
1029 n
= sbunlinkmbuf(&so
->so_rcv
.sb
, m
, NULL
);
1033 m
= sbunlinkmbuf(&so
->so_rcv
.sb
, m
, &free_chain
);
1037 if (flags
& MSG_PEEK
) {
1041 n
= m_copym(m
, 0, len
, MB_WAIT
);
1047 so
->so_rcv
.ssb_cc
-= len
;
1050 if (so
->so_oobmark
) {
1051 if ((flags
& MSG_PEEK
) == 0) {
1052 so
->so_oobmark
-= len
;
1053 if (so
->so_oobmark
== 0) {
1054 so
->so_state
|= SS_RCVATMARK
;
1059 if (offset
== so
->so_oobmark
)
1063 if (flags
& MSG_EOR
)
1066 * If the MSG_WAITALL flag is set (for non-atomic socket),
1067 * we must not quit until resid == 0 or an error
1068 * termination. If a signal/timeout occurs, return
1069 * with a short count but without error.
1070 * Keep signalsockbuf locked against other readers.
1072 while ((flags
& MSG_WAITALL
) && m
== NULL
&&
1073 resid
> 0 && !sosendallatonce(so
) &&
1074 so
->so_rcv
.ssb_mb
== NULL
) {
1075 if (so
->so_error
|| so
->so_state
& SS_CANTRCVMORE
)
1078 * The window might have closed to zero, make
1079 * sure we send an ack now that we've drained
1080 * the buffer or we might end up blocking until
1081 * the idle takes over (5 seconds).
1083 if (pr
->pr_flags
& PR_WANTRCVD
&& so
->so_pcb
)
1084 so_pru_rcvd(so
, flags
);
1085 error
= ssb_wait(&so
->so_rcv
);
1087 ssb_unlock(&so
->so_rcv
);
1091 m
= so
->so_rcv
.ssb_mb
;
1096 * If an atomic read was requested but unread data still remains
1097 * in the record, set MSG_TRUNC.
1099 if (m
&& pr
->pr_flags
& PR_ATOMIC
)
1103 * Cleanup. If an atomic read was requested drop any unread data.
1105 if ((flags
& MSG_PEEK
) == 0) {
1106 if (m
&& (pr
->pr_flags
& PR_ATOMIC
))
1107 sbdroprecord(&so
->so_rcv
.sb
);
1108 if ((pr
->pr_flags
& PR_WANTRCVD
) && so
->so_pcb
)
1109 so_pru_rcvd(so
, flags
);
1112 if (orig_resid
== resid
&& orig_resid
&&
1113 (flags
& MSG_EOR
) == 0 && (so
->so_state
& SS_CANTRCVMORE
) == 0) {
1114 ssb_unlock(&so
->so_rcv
);
1122 ssb_unlock(&so
->so_rcv
);
1126 m_freem(free_chain
);
1131 soshutdown(struct socket
*so
, int how
)
1133 if (!(how
== SHUT_RD
|| how
== SHUT_WR
|| how
== SHUT_RDWR
))
1139 return (so_pru_shutdown(so
));
1144 sorflush(struct socket
*so
)
1146 struct signalsockbuf
*ssb
= &so
->so_rcv
;
1147 struct protosw
*pr
= so
->so_proto
;
1148 struct signalsockbuf asb
;
1150 ssb
->ssb_flags
|= SSB_NOINTR
;
1151 (void) ssb_lock(ssb
, M_WAITOK
);
1157 bzero((caddr_t
)ssb
, sizeof (*ssb
));
1158 if (asb
.ssb_flags
& SSB_KNOTE
) {
1159 ssb
->ssb_sel
.si_note
= asb
.ssb_sel
.si_note
;
1160 ssb
->ssb_flags
= SSB_KNOTE
;
1164 if (pr
->pr_flags
& PR_RIGHTS
&& pr
->pr_domain
->dom_dispose
)
1165 (*pr
->pr_domain
->dom_dispose
)(asb
.ssb_mb
);
1166 ssb_release(&asb
, so
);
1171 do_setopt_accept_filter(struct socket
*so
, struct sockopt
*sopt
)
1173 struct accept_filter_arg
*afap
= NULL
;
1174 struct accept_filter
*afp
;
1175 struct so_accf
*af
= so
->so_accf
;
1178 /* do not set/remove accept filters on non listen sockets */
1179 if ((so
->so_options
& SO_ACCEPTCONN
) == 0) {
1184 /* removing the filter */
1187 if (af
->so_accept_filter
!= NULL
&&
1188 af
->so_accept_filter
->accf_destroy
!= NULL
) {
1189 af
->so_accept_filter
->accf_destroy(so
);
1191 if (af
->so_accept_filter_str
!= NULL
) {
1192 FREE(af
->so_accept_filter_str
, M_ACCF
);
1197 so
->so_options
&= ~SO_ACCEPTFILTER
;
1200 /* adding a filter */
1201 /* must remove previous filter first */
1206 /* don't put large objects on the kernel stack */
1207 MALLOC(afap
, struct accept_filter_arg
*, sizeof(*afap
), M_TEMP
, M_WAITOK
);
1208 error
= sooptcopyin(sopt
, afap
, sizeof *afap
, sizeof *afap
);
1209 afap
->af_name
[sizeof(afap
->af_name
)-1] = '\0';
1210 afap
->af_arg
[sizeof(afap
->af_arg
)-1] = '\0';
1213 afp
= accept_filt_get(afap
->af_name
);
1218 MALLOC(af
, struct so_accf
*, sizeof(*af
), M_ACCF
, M_WAITOK
| M_ZERO
);
1219 if (afp
->accf_create
!= NULL
) {
1220 if (afap
->af_name
[0] != '\0') {
1221 int len
= strlen(afap
->af_name
) + 1;
1223 MALLOC(af
->so_accept_filter_str
, char *, len
, M_ACCF
, M_WAITOK
);
1224 strcpy(af
->so_accept_filter_str
, afap
->af_name
);
1226 af
->so_accept_filter_arg
= afp
->accf_create(so
, afap
->af_arg
);
1227 if (af
->so_accept_filter_arg
== NULL
) {
1228 FREE(af
->so_accept_filter_str
, M_ACCF
);
1235 af
->so_accept_filter
= afp
;
1237 so
->so_options
|= SO_ACCEPTFILTER
;
1246 * Perhaps this routine, and sooptcopyout(), below, ought to come in
1247 * an additional variant to handle the case where the option value needs
1248 * to be some kind of integer, but not a specific size.
1249 * In addition to their use here, these functions are also called by the
1250 * protocol-level pr_ctloutput() routines.
1253 sooptcopyin(struct sockopt
*sopt
, void *buf
, size_t len
, size_t minlen
)
1255 return soopt_to_kbuf(sopt
, buf
, len
, minlen
);
1259 soopt_to_kbuf(struct sockopt
*sopt
, void *buf
, size_t len
, size_t minlen
)
1263 KKASSERT(!sopt
->sopt_val
|| kva_p(sopt
->sopt_val
));
1264 KKASSERT(kva_p(buf
));
1267 * If the user gives us more than we wanted, we ignore it,
1268 * but if we don't get the minimum length the caller
1269 * wants, we return EINVAL. On success, sopt->sopt_valsize
1270 * is set to however much we actually retrieved.
1272 if ((valsize
= sopt
->sopt_valsize
) < minlen
)
1275 sopt
->sopt_valsize
= valsize
= len
;
1277 bcopy(sopt
->sopt_val
, buf
, valsize
);
1283 sosetopt(struct socket
*so
, struct sockopt
*sopt
)
1291 sopt
->sopt_dir
= SOPT_SET
;
1292 if (sopt
->sopt_level
!= SOL_SOCKET
) {
1293 if (so
->so_proto
&& so
->so_proto
->pr_ctloutput
) {
1294 return (so_pru_ctloutput(so
, sopt
));
1296 error
= ENOPROTOOPT
;
1298 switch (sopt
->sopt_name
) {
1300 case SO_ACCEPTFILTER
:
1301 error
= do_setopt_accept_filter(so
, sopt
);
1307 error
= sooptcopyin(sopt
, &l
, sizeof l
, sizeof l
);
1311 so
->so_linger
= l
.l_linger
;
1313 so
->so_options
|= SO_LINGER
;
1315 so
->so_options
&= ~SO_LINGER
;
1321 case SO_USELOOPBACK
:
1327 error
= sooptcopyin(sopt
, &optval
, sizeof optval
,
1332 so
->so_options
|= sopt
->sopt_name
;
1334 so
->so_options
&= ~sopt
->sopt_name
;
1341 error
= sooptcopyin(sopt
, &optval
, sizeof optval
,
1347 * Values < 1 make no sense for any of these
1348 * options, so disallow them.
1355 switch (sopt
->sopt_name
) {
1358 if (ssb_reserve(sopt
->sopt_name
== SO_SNDBUF
?
1359 &so
->so_snd
: &so
->so_rcv
, (u_long
)optval
,
1361 &curproc
->p_rlimit
[RLIMIT_SBSIZE
]) == 0) {
1368 * Make sure the low-water is never greater than
1372 so
->so_snd
.ssb_lowat
=
1373 (optval
> so
->so_snd
.ssb_hiwat
) ?
1374 so
->so_snd
.ssb_hiwat
: optval
;
1377 so
->so_rcv
.ssb_lowat
=
1378 (optval
> so
->so_rcv
.ssb_hiwat
) ?
1379 so
->so_rcv
.ssb_hiwat
: optval
;
1386 error
= sooptcopyin(sopt
, &tv
, sizeof tv
,
1391 /* assert(hz > 0); */
1392 if (tv
.tv_sec
< 0 || tv
.tv_sec
> SHRT_MAX
/ hz
||
1393 tv
.tv_usec
< 0 || tv
.tv_usec
>= 1000000) {
1397 /* assert(tick > 0); */
1398 /* assert(ULONG_MAX - SHRT_MAX >= 1000000); */
1399 val
= (u_long
)(tv
.tv_sec
* hz
) + tv
.tv_usec
/ tick
;
1400 if (val
> SHRT_MAX
) {
1404 if (val
== 0 && tv
.tv_usec
!= 0)
1407 switch (sopt
->sopt_name
) {
1409 so
->so_snd
.ssb_timeo
= val
;
1412 so
->so_rcv
.ssb_timeo
= val
;
1417 error
= ENOPROTOOPT
;
1420 if (error
== 0 && so
->so_proto
&& so
->so_proto
->pr_ctloutput
) {
1421 (void) so_pru_ctloutput(so
, sopt
);
1428 /* Helper routine for getsockopt */
1430 sooptcopyout(struct sockopt
*sopt
, const void *buf
, size_t len
)
1432 soopt_from_kbuf(sopt
, buf
, len
);
1437 soopt_from_kbuf(struct sockopt
*sopt
, const void *buf
, size_t len
)
1441 KKASSERT(!sopt
->sopt_val
|| kva_p(sopt
->sopt_val
));
1442 KKASSERT(kva_p(buf
));
1445 * Documented get behavior is that we always return a value,
1446 * possibly truncated to fit in the user's buffer.
1447 * Traditional behavior is that we always tell the user
1448 * precisely how much we copied, rather than something useful
1449 * like the total amount we had available for her.
1450 * Note that this interface is not idempotent; the entire answer must
1451 * generated ahead of time.
1453 valsize
= min(len
, sopt
->sopt_valsize
);
1454 sopt
->sopt_valsize
= valsize
;
1455 if (sopt
->sopt_val
!= 0) {
1456 bcopy(buf
, sopt
->sopt_val
, valsize
);
1461 sogetopt(struct socket
*so
, struct sockopt
*sopt
)
1467 struct accept_filter_arg
*afap
;
1471 sopt
->sopt_dir
= SOPT_GET
;
1472 if (sopt
->sopt_level
!= SOL_SOCKET
) {
1473 if (so
->so_proto
&& so
->so_proto
->pr_ctloutput
) {
1474 return (so_pru_ctloutput(so
, sopt
));
1476 return (ENOPROTOOPT
);
1478 switch (sopt
->sopt_name
) {
1480 case SO_ACCEPTFILTER
:
1481 if ((so
->so_options
& SO_ACCEPTCONN
) == 0)
1483 MALLOC(afap
, struct accept_filter_arg
*, sizeof(*afap
),
1484 M_TEMP
, M_WAITOK
| M_ZERO
);
1485 if ((so
->so_options
& SO_ACCEPTFILTER
) != 0) {
1486 strcpy(afap
->af_name
, so
->so_accf
->so_accept_filter
->accf_name
);
1487 if (so
->so_accf
->so_accept_filter_str
!= NULL
)
1488 strcpy(afap
->af_arg
, so
->so_accf
->so_accept_filter_str
);
1490 error
= sooptcopyout(sopt
, afap
, sizeof(*afap
));
1496 l
.l_onoff
= so
->so_options
& SO_LINGER
;
1497 l
.l_linger
= so
->so_linger
;
1498 error
= sooptcopyout(sopt
, &l
, sizeof l
);
1501 case SO_USELOOPBACK
:
1510 optval
= so
->so_options
& sopt
->sopt_name
;
1512 error
= sooptcopyout(sopt
, &optval
, sizeof optval
);
1516 optval
= so
->so_type
;
1520 optval
= so
->so_error
;
1525 optval
= so
->so_snd
.ssb_hiwat
;
1529 optval
= so
->so_rcv
.ssb_hiwat
;
1533 optval
= so
->so_snd
.ssb_lowat
;
1537 optval
= so
->so_rcv
.ssb_lowat
;
1542 optval
= (sopt
->sopt_name
== SO_SNDTIMEO
?
1543 so
->so_snd
.ssb_timeo
: so
->so_rcv
.ssb_timeo
);
1545 tv
.tv_sec
= optval
/ hz
;
1546 tv
.tv_usec
= (optval
% hz
) * tick
;
1547 error
= sooptcopyout(sopt
, &tv
, sizeof tv
);
1551 error
= ENOPROTOOPT
;
1558 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
1560 soopt_getm(struct sockopt
*sopt
, struct mbuf
**mp
)
1562 struct mbuf
*m
, *m_prev
;
1563 int sopt_size
= sopt
->sopt_valsize
, msize
;
1565 m
= m_getl(sopt_size
, sopt
->sopt_td
? MB_WAIT
: MB_DONTWAIT
, MT_DATA
,
1569 m
->m_len
= min(msize
, sopt_size
);
1570 sopt_size
-= m
->m_len
;
1574 while (sopt_size
> 0) {
1575 m
= m_getl(sopt_size
, sopt
->sopt_td
? MB_WAIT
: MB_DONTWAIT
,
1576 MT_DATA
, 0, &msize
);
1581 m
->m_len
= min(msize
, sopt_size
);
1582 sopt_size
-= m
->m_len
;
1589 /* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */
1591 soopt_mcopyin(struct sockopt
*sopt
, struct mbuf
*m
)
1593 soopt_to_mbuf(sopt
, m
);
1598 soopt_to_mbuf(struct sockopt
*sopt
, struct mbuf
*m
)
1603 KKASSERT(!sopt
->sopt_val
|| kva_p(sopt
->sopt_val
));
1605 if (sopt
->sopt_val
== NULL
)
1607 val
= sopt
->sopt_val
;
1608 valsize
= sopt
->sopt_valsize
;
1609 while (m
!= NULL
&& valsize
>= m
->m_len
) {
1610 bcopy(val
, mtod(m
, char *), m
->m_len
);
1611 valsize
-= m
->m_len
;
1612 val
= (caddr_t
)val
+ m
->m_len
;
1615 if (m
!= NULL
) /* should be allocated enoughly at ip6_sooptmcopyin() */
1616 panic("ip6_sooptmcopyin");
1619 /* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */
1621 soopt_mcopyout(struct sockopt
*sopt
, struct mbuf
*m
)
1623 return soopt_from_mbuf(sopt
, m
);
1627 soopt_from_mbuf(struct sockopt
*sopt
, struct mbuf
*m
)
1629 struct mbuf
*m0
= m
;
1634 KKASSERT(!sopt
->sopt_val
|| kva_p(sopt
->sopt_val
));
1636 if (sopt
->sopt_val
== NULL
)
1638 val
= sopt
->sopt_val
;
1639 maxsize
= sopt
->sopt_valsize
;
1640 while (m
!= NULL
&& maxsize
>= m
->m_len
) {
1641 bcopy(mtod(m
, char *), val
, m
->m_len
);
1642 maxsize
-= m
->m_len
;
1643 val
= (caddr_t
)val
+ m
->m_len
;
1644 valsize
+= m
->m_len
;
1648 /* enough soopt buffer should be given from user-land */
1652 sopt
->sopt_valsize
= valsize
;
1657 sohasoutofband(struct socket
*so
)
1659 if (so
->so_sigio
!= NULL
)
1660 pgsigio(so
->so_sigio
, SIGURG
, 0);
1661 selwakeup(&so
->so_rcv
.ssb_sel
);
1665 sopoll(struct socket
*so
, int events
, struct ucred
*cred
, struct thread
*td
)
1671 if (events
& (POLLIN
| POLLRDNORM
))
1673 revents
|= events
& (POLLIN
| POLLRDNORM
);
1675 if (events
& POLLINIGNEOF
)
1676 if (so
->so_rcv
.ssb_cc
>= so
->so_rcv
.ssb_lowat
||
1677 !TAILQ_EMPTY(&so
->so_comp
) || so
->so_error
)
1678 revents
|= POLLINIGNEOF
;
1680 if (events
& (POLLOUT
| POLLWRNORM
))
1681 if (sowriteable(so
))
1682 revents
|= events
& (POLLOUT
| POLLWRNORM
);
1684 if (events
& (POLLPRI
| POLLRDBAND
))
1685 if (so
->so_oobmark
|| (so
->so_state
& SS_RCVATMARK
))
1686 revents
|= events
& (POLLPRI
| POLLRDBAND
);
1690 (POLLIN
| POLLINIGNEOF
| POLLPRI
| POLLRDNORM
|
1692 selrecord(td
, &so
->so_rcv
.ssb_sel
);
1693 so
->so_rcv
.ssb_flags
|= SSB_SEL
;
1696 if (events
& (POLLOUT
| POLLWRNORM
)) {
1697 selrecord(td
, &so
->so_snd
.ssb_sel
);
1698 so
->so_snd
.ssb_flags
|= SSB_SEL
;
1707 sokqfilter(struct file
*fp
, struct knote
*kn
)
1709 struct socket
*so
= (struct socket
*)kn
->kn_fp
->f_data
;
1710 struct signalsockbuf
*ssb
;
1712 switch (kn
->kn_filter
) {
1714 if (so
->so_options
& SO_ACCEPTCONN
)
1715 kn
->kn_fop
= &solisten_filtops
;
1717 kn
->kn_fop
= &soread_filtops
;
1721 kn
->kn_fop
= &sowrite_filtops
;
1729 SLIST_INSERT_HEAD(&ssb
->ssb_sel
.si_note
, kn
, kn_selnext
);
1730 ssb
->ssb_flags
|= SSB_KNOTE
;
1736 filt_sordetach(struct knote
*kn
)
1738 struct socket
*so
= (struct socket
*)kn
->kn_fp
->f_data
;
1741 SLIST_REMOVE(&so
->so_rcv
.ssb_sel
.si_note
, kn
, knote
, kn_selnext
);
1742 if (SLIST_EMPTY(&so
->so_rcv
.ssb_sel
.si_note
))
1743 so
->so_rcv
.ssb_flags
&= ~SSB_KNOTE
;
1749 filt_soread(struct knote
*kn
, long hint
)
1751 struct socket
*so
= (struct socket
*)kn
->kn_fp
->f_data
;
1753 kn
->kn_data
= so
->so_rcv
.ssb_cc
;
1754 if (so
->so_state
& SS_CANTRCVMORE
) {
1755 kn
->kn_flags
|= EV_EOF
;
1756 kn
->kn_fflags
= so
->so_error
;
1759 if (so
->so_error
) /* temporary udp error */
1761 if (kn
->kn_sfflags
& NOTE_LOWAT
)
1762 return (kn
->kn_data
>= kn
->kn_sdata
);
1763 return (kn
->kn_data
>= so
->so_rcv
.ssb_lowat
);
1767 filt_sowdetach(struct knote
*kn
)
1769 struct socket
*so
= (struct socket
*)kn
->kn_fp
->f_data
;
1772 SLIST_REMOVE(&so
->so_snd
.ssb_sel
.si_note
, kn
, knote
, kn_selnext
);
1773 if (SLIST_EMPTY(&so
->so_snd
.ssb_sel
.si_note
))
1774 so
->so_snd
.ssb_flags
&= ~SSB_KNOTE
;
1780 filt_sowrite(struct knote
*kn
, long hint
)
1782 struct socket
*so
= (struct socket
*)kn
->kn_fp
->f_data
;
1784 kn
->kn_data
= ssb_space(&so
->so_snd
);
1785 if (so
->so_state
& SS_CANTSENDMORE
) {
1786 kn
->kn_flags
|= EV_EOF
;
1787 kn
->kn_fflags
= so
->so_error
;
1790 if (so
->so_error
) /* temporary udp error */
1792 if (((so
->so_state
& SS_ISCONNECTED
) == 0) &&
1793 (so
->so_proto
->pr_flags
& PR_CONNREQUIRED
))
1795 if (kn
->kn_sfflags
& NOTE_LOWAT
)
1796 return (kn
->kn_data
>= kn
->kn_sdata
);
1797 return (kn
->kn_data
>= so
->so_snd
.ssb_lowat
);
1802 filt_solisten(struct knote
*kn
, long hint
)
1804 struct socket
*so
= (struct socket
*)kn
->kn_fp
->f_data
;
1806 kn
->kn_data
= so
->so_qlen
;
1807 return (! TAILQ_EMPTY(&so
->so_comp
));